Yeast as fered additive in tilapia fingerlings diets

An experiment was conducted to evaluate the possibility of usage of dried baker's yeast [DBY] as feed additive in tilapia fingerling diets. Four experimental diets were formulated to be isonitrogenous and isocaloric. Diet 1 served as a control one, while diets 2, 3 and 4 contained 1, 2 and 3% DBY, respectively. Diets were fed for an 8-week experimental period. Fish fed on diets contained 3% DBY showed very high mortality even with fish replacement. Fish fed on the control diet showed the best performance parameters [final body weight, weight gain, increase in total body length, FCR and PER]. Fish fed on diets contained 1% DBY showed a closely related performance as control group, while 2% DBY showed a negative effect. Apparent digestibility coefficient [ADC] was determined for all experimental diets using chromic oxide as indicator. The results revealed that DBY at level of 1 or 2% did not significantly affect the ADC of DM, GE, EE and CP of the diets

Practical approach to fat inclusion in broilers diets

This work was planned to throw a light on a practical approach currently used by poultry growers in Egypt to include different sources of fat in broilers diets to promote more gain and better finished carcass. One hundred and fifty day old commercial broiler chicks were equally allocated into six groups and fed on basal diet to which either animal fat [beef tallow] or vegetable oil [cottonseed oil + sunflower oil] was added at the level of 1 or 2% for 6 weeks experimental period. It is concluded that the inclusion of fat [animal and vegetable] at the level of 1 or 2% to broiler diets could improve broiler performance under high environmental temperature. In regard to fat source, CSO as a vegetable oil seemed to achieve better performance than did beef tallow, meanwhile, the higher level of CSO achieved better performance than its lower level. However, the usage of 2% CSO in growing period was not able to overcome the adverse effect of heat stress commonly occuring during our summer season. Concerning blood parameters, no significant difference could be detected for SGOT, SGPT and total serum protein which indicated that there are no detrmintal influence for such treatments. Serum cholesterol level was increased due to fat supplementation but beef tallow addition induced the highest values

Effect of growth promotor [virginiamycin] on broiler performance under Egyptian environment

Two groups each of 500 one-day old Red Hypeco chicks were fed on basal diet [group C], while other group [group V] was fed basal diet supplemented with 20 ppm virginiamycin. Virginiamycin supplementation gave better body weight gain, less feed consumption, better FCR, less mortality rates and better dressing values than the control group. E. coli [01:K1 and 078:K80] was isolated from both groups at the age of one day old and 24 days old respectively. E. coli 01:K1 and proteus vulgaris were isolated from cloacal swab at 49 day old. Virginiamycin had an effect on E. coli plate count for cloacal swab at 49 day old and was 30 x 10[11] and 30 x 10[16] for group V and C respectively. Virginiamycin had no significant immune stimulus effect on the immune response against ND and IBD